Precast slab and building construction



Aug. 24, 1937. Q E AV 2,091,140

PRECAST SLAB AND BUILDING EONSTRUCTION Filed July 9, 1935 1 INVENTOR.

/ BY g fizz-Mum ATTORNEY.

Patented Au 24, 1937 PATENT OFFICE" PRECAST SLABAND BUILDING CONSTRUCTION Clarke F. Davis, Short Hills, N. J., assignor to American Cyanamid & Chemical Corporation,

New York, N. Y., a corporation of Delaware Application July 9, 1935, Serial No. 30,432

4 Claims.

The present application is directed to a part of the subject matter shown and described in my co-pending application Serial No. 655,591, filed .February 7th, 1933.

The present invention relates to a building construction of precast units where those units are provided with metal on their abutting edges, said metal being so arranged as to interlock the edges together, such as by tongues and grooves.

10 The invention is also directed to the units per se.

The principal object of the invention is to provide a construction of the above type which is particularly adaptable for floors, roofs, walls, ceilings or combinations thereof.

To this end, the invention contemplates a precast unit of set cementitious material of which gypsum is typical, either with or without fillers such as wood chips and with or without internal reinforcing. This unit is provided on two adjacent faces with a sheet metal covering, the ends of which are embedded in the body material, the metal covering being tongued and grooved. This particular unit may serve as a corner post between two vertical walls, a sill between a floor and a wall, a sill between a wall and a ceiling, a

sill between a wall and a roof or a roof ridgepole.

Other elongated slab units also of set cementitious material, such as gypsum, may be used as the elements from which the walls, floors, ceilings or roof are constructed, and are provided on their longitudinal edges with metal elements having complementary tongues and grooves. These several units are designed to be arranged edge to edge with the metal portions in contact or partially in contact with the tongue of one engaging the other in an interlocking manner, the end unit likewise interlocking with the post or sill unit.

The invention further contemplates the oflseti ting of a portion of the metal edging from the main plane. of the edge of a unit for a purpose more fully hereinafter described.

The invention further consists in the novel arrangement and construction of parts more fully hereinafter described and shown in the accompanying drawing, in which- Fig. 1 is a sectional view illustrating the present invention; Fig. 2 is a view along the line 2-2 of Fig. 1; Fig. 3 is a perspective view of one embodiment of the invention.

Referring now with particularity to the embodiments illustrated, there is shown in Fig. 1 typical precast slabs A and B of a series, with an intermediate joining unit C. In the view referred to and considering it from the standpoint of being a sectional plan view of a comer post and two abutting walls, the post C is substantially rectangular in lateral cross-section and 5 elongated to the desired extent. A sheet metal covering l is applied thereto and that portion on two adjacent faces thereof is provided with a tongue 2 and a groove 3. The ends 4 of the metal member I are embedded in the body of the unit C. 10 Each of slabs A and B may be cast of gypsum or the like, the edges thereof being provided with metal elements 5, the elements on opposite edges being correspondingly tongued and grooved. Likewise, the metal members 5 have their ends 6 15 embedded in the slab body. As shown, the slabs A and B may be longitudinally grooved or bisquetted on one face to permit of a slab of increased depth without corresponding increase in weight, although this bisquetting is not necessary. Considering Fig. 1 from the above viewpoint, the unit C may be a corner post extending vertically between two vertical walls in which the slabs A andB are the end units. These slabs each engage the corner post C in an interlocking manner due to the provision of corresponding metal edge members. Obviously any number of units A and B may be used, dependent upon the ex-v tent of the wall itself.

It will, of course, be obvious that a substan- 30 tially close fit is desired between the tongues and grooves of the various interlocking units. It sometimes happens during manufacture that a. part of the plastic material of which these slabs are made slops over onto the metal edge and 35 hardens there. This would normally cause an undesirable misfit of the units. In order to avoid this, one section I of the metal edge 5 may be oifset from the plane of the unit edge so that as long as the part 5 fits closely with the neighbor- 40 ing portion of the metal element I, a proper tongued and grooved fit is assured. While, 01' course, this is not as desirable as the joint at the right hand end of Fig. 1, yet it does provide means whereby the danger of undue spacing 5 apart of the joint is materially lessened. a

It will also be apparent that this same principle is applicable to a floor and wall where the member C acts as a sill. By turning Fig. 1 upside down, it will be noted that slab A then be- 50 comes part of a floor system, slab C the horizontal sill and slab B the first unit of those constituting a wall system. Obviously any type of finish may be applied to the floor and wall slabs A and B where desired. 55

Another aspect of Fig. 1 is that wherein it appears as a sectional view through the corner of a vertical wall and horizontal floor and/0::- ceiling. That is, slab B may be the top unit oi a ver-- tical wall, slab C the sill at the top of the wall and slab A the first unit of a ceiling and/0r floor.

Still another aspect of Fig. 1 may be that oi a. sectional view of a roof. This may be observed by rotating Fig. 1 at an agle of 45 in a clockwise direction. Slab C then becomes the ridgepole of a roof and slabs A and B the top row of roof units.

In all of the above situations there is the same type of interlocking action secured, reinforced by the metal edging.

In the claims, where the word surface" is used, it is intended to cover floors. roofs, ceilings, or walls or an appropriate combination thereof.

I claim:

1. A precast slab of set cementitious material having two adjacent faces covered by a metallic member, the edges of which are turned back into the slab body, said slab having a tongue on one face and a corresponding groove on its adjacent face.

2. A precast slab of set cementitious material having two adjacent faces covered by metal, one of said faces being tongued and the other correspondingly grooved.

3. A building construction comprising two sur- I CLARKE F. DAVIS. 

